The parents of a 17-year-old Florida boy whose death sparked a national outcry visited Capitol Hill Tuesday to thank those who have called attention to their son’s death.

The parents of Trayvon Martin, who was shot and killed by neighborhood watchman George Zimmerman last month, spoke briefly before a congressional panel. They began with a moment of silence for their son, who was killed in a gated community in Florida while returning from a convenience store.

The incident has spawned rallies across the country from thousands who have called for Zimmerman’s arrest. Police have said he acted in self defense.

New reports that say Martin was the aggressor has been met by anger from his family. His parents say Martin is being demonized by the media because recent stories have cited how he was suspended three times the past year.

"They killed my son and now they're trying to kill his reputation," Fulton told reporters.

Martin was suspended by Miami-Dade County schools because traces of marijuana were found in a plastic baggie in his book bag, family spokesman Ryan Julison said. Martin was serving the suspension when he was shot Feb. 26.

A Florida police department also said Tuesday that women's jewelry found in Trayvon Martin's school backpack last year didn't match any that had been reported stolen.

The Miami Herald obtained a Miami-Dade Schools Police Department report that showed the slain teenager was suspended in October for writing obscene graffiti on a door at his high school.

The report says that during a search of his backpack, security officers found jewelry and a screwdriver that they felt could be a burglary tool. Martin told them a friend had given him the jewelry, but wouldn't say who.

Miami-Dade Police confirmed Tuesday that the jewelry didn't match any that had been reported stolen.